William and Kate, both 34, walked by a large photograph of Diana during their visit to the center, People reports. The photograph prompted William, who was just 15 when his mother died in 1997, to remark that it was nice to have a "family connection."

Britain's Catherine, Duchess of Cambridge, unveiled a plaque at Francis House during a visit to the hospice.

“I was saying I was here when Princess Diana opened Francis House 25 years ago, and he said it’s nice to have the family connection and that it feels very family here,” said Natalie Hands, the hospice center's clinical leader.

OLI SCARFF / AFP - Getty Images

William and Kate spoke with families receiving support at Francis House.

During their historic trip, both William and Kate spent time speaking with the center's young people and their families.